title-reader

Arguments:
check-box-column-mixin

An accessor on a check-box column (an instance of a subclass of
grid-column and check-box-column-mixin) of a
grid-widget. Returns (or sets with
setf) the name of a function
which will be called in order to obtain the string to display in each
check-box grid cell. A title-reader may also be nil rather than a function, in which case no string
is displayed and the check-box gadget is centered horizontally in the
grid cell. The default value is nil.

The function should take an arbitrary grid-row's data-object as its only argument,
and return a string to display in that row. For example, here is the
title-reader
function for the "Full Time?" column of the employee grid example on
the Examples tab of the Navigator dialog: